JP5204313B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device.

2. Description of the Related Art A speaker device including a cabinet and a speaker unit is known that includes a phase inversion type cabinet that actively uses sound radiated from the back side of the speaker unit (diaphragm). A cabinet such as a bass-reflex type or an axtimus (registered trademark of Bose Corporation) form a space of a predetermined volume on the back side of the speaker unit, one end is opened in the space, and the other end is the acoustic radiation of the speaker unit. It has a duct that opens to the side.

  In Patent Document 1 below, as a speaker device that can reproduce a low frequency range with a small and light device, a speaker unit is attached to the center of the rear plate of the speaker box, and a low-frequency sound reproduction duct is provided on the sound radiation side of the speaker unit. And a bass reflex duct on the back side of the speaker unit. The bass reproduction duct is composed of a first duct section and a second duct section. The first duct section extends along the rear panel and the upper panel. The speaker unit is opened at the upper front portion of the speaker unit, and the second duct portion extends along the rear plate and the lower plate and opens at the lower front portion of the speaker box.

  In Patent Document 2 below, a first duct extending in a direction orthogonal to the radiation direction of the sound pressure radiated from the front side of the speaker unit, and one end of the first duct are provided. A second duct extended by joining, and a speaker unit is arranged at a joint between the first duct and the second duct, and the sound pressure radiated from the back side of the speaker unit is transmitted to the second duct. Are transmitted to the first duct through the first duct, and merged with the sound pressure radiated from the front side of the speaker unit and discharged from the first duct to the outside.

Japanese Patent Laid-Open No. 11-136786 Japanese Patent No. 3410206

In the speaker device including the cabinet as described above, it is necessary to secure a space for arranging the speaker device in accordance with the volume of the cabinet. In the case of adopting the bass reflex type or the acustimas (registered trademark of Bose Corporation) type cabinet described above, an air chamber is provided on the opposite side to the sound emission side of the speaker unit, and the sound of the speaker unit is provided from this air chamber. Since it is necessary to provide a duct extending to the radiation side, installation in a narrow space becomes difficult. Further, when a plurality of speaker units are provided, it is necessary to secure a sufficient volume of the air chamber in order to obtain good acoustic characteristics in the low frequency range. There is a problem that becomes severe.

  In the case where the speaker device is arranged in a limited space such as a passenger compartment, it is effective to increase the space utilization efficiency by arranging the speaker device using a space that is originally a dead space. At this time, if the space that originally becomes a dead space is used for the air chamber of the cabinet, the volume of the air chamber is limited, so the cabinet partitioning method, speaker unit arrangement, and duct arrangement must be performed efficiently. Is required.

For example, when a speaker device is mounted on a spare tire housed in a vehicle body, there is a restriction that the outer diameter of the speaker device must be smaller than the inner diameter of the spare tire or smaller than the outer diameter of the wheel. Therefore, the outer diameter and shape of the cabinet are inevitably restricted. In such a speaker device, for example, if an cabinet of Acoustimas (registered trademark of Bose Corporation) is to be adopted, the arrangement of the air chambers and ducts on the front side and the back side of the speaker unit will not be necessary. Good acoustic characteristics cannot be obtained. Further, when two or more speaker units are to be arranged, an efficient arrangement of air chambers and ducts including the arrangement of the speaker units is required.

  In the speaker device for low sound reproduction in which the speaker unit is arranged in the cabinet, the diameter of the diaphragm of the speaker unit is limited by the height of the cabinet. Therefore, depending on the installation space of the speaker device, a desired high sound pressure can be obtained. The diaphragm diameter may not be set. In this case, if an attempt is made to obtain a large sound pressure by increasing the amplitude of the diaphragm, it is difficult to design the support system and drive system of the speaker unit, and as a result, there is a problem that the reproduced sound pressure is likely to be distorted.

  This invention makes it an example of a subject to cope with such a problem. In other words, it is possible to effectively secure the air chamber of the cabinet even in a limited installation space of the speaker device, and obtain good acoustic characteristics in the low frequency range, and further, the outer diameter and shape of the cabinet are limited. Even if it is, the air chambers and ducts can be arranged efficiently to adopt a phase-inverted cabinet, and even when using multiple speaker units, a relatively large air chamber is ensured In addition to being able to efficiently use the space in the cabinet, in the speaker device for low sound reproduction in which the speaker unit is arranged in the cabinet, the diaphragm aperture is limited by the installation space of the speaker device. The purpose of the present invention is to enable generation of high sound pressure and to generate high-quality reproduced sound. A.

  In order to achieve such an object, the speaker device according to the present invention has at least the following configuration.

  A cabinet composed of a casing part and a lid part, and a wall part that is arranged in the cabinet and extends from the central part of the cabinet toward two different positions on the outer peripheral part to partition the cabinet space And a plurality of speaker units disposed in the cabinet and attached to the wall portion, the first speaker unit is disposed in one space defined by the wall portion, and the first speaker unit While directing the acoustic radiation surface to the other space defined by the wall portion, the second speaker unit is disposed in the other space, and the acoustic radiation surface of the second speaker unit is directed to the one space, The speaker device, wherein the cabinet is provided with a duct for communicating the space with the outside.

It is explanatory drawing (perspective view) which showed the external appearance structure of the speaker apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which showed the internal structure of the speaker apparatus which concerns on one Embodiment of this invention. It is explanatory drawing (perspective view of the speaker apparatus 1 of the state which removed the cover part) which shows the duct structure of the speaker apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which showed the attachment relationship of the housing | casing part and wall part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing (the figure (a) is a top view, the figure (b) is a back side perspective view) which showed the cover part of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing (the figure (a) is a top view, the figure (b) is a back side perspective view) which showed the sound emission part of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing (the figure (a) is an external appearance perspective view, the figure (b) is a cross-sectional perspective view) which showed the speaker unit of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of mounting of the speaker apparatus 1 which concerns on embodiment of this invention. It is explanatory drawing which showed the motor vehicle carrying the speaker apparatus based on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto. FIG. 1 is an explanatory diagram (perspective view) showing an external configuration of a speaker device 1 according to an embodiment of the present invention, and FIG. 2 is an explanation showing an internal structure of the speaker device 1 according to an embodiment of the present invention. FIG.

A speaker device 1 according to an embodiment of the present invention includes a cabinet 2 and a duct 4, and a speaker unit 3 (3 ₁ , 3 ₂ ) is provided in the cabinet 2. The cabinet 2 includes at least a casing 10 and a lid 13, and a duct 4 is provided in the cabinet 2. In the example shown in the figure, the cabinet 2 is formed of a housing part 10 and a sound emitting part 14 which is a separate member, and the sound emitting part 14 is provided with a duct 4 (4 ₁ , 4 ₂ ). However, the present invention is not limited to this, and the housing 10 and the sound emitting unit 14 may be integrated, and the duct 4 (4 ₁ , 4 ₂ ) may be provided there. The speaker device 1 is particularly suitable for low-frequency reproduction, and sound emitted from the speaker unit driven in the cabinet 2 is emitted to the outside from the duct 4 (4 ₁ , 4 ₂ ). In the illustrated example, the side surface shape of the casing unit 10 forming the cabinet 2 is an example of a columnar shape, but is not limited thereto, and may be various shapes such as a rectangular shape. The shape of the cabinet 2 is set according to the form of the space in which the speaker device 1 is stored. The housing part 10, the sound emitting part 14, and the cover part 13 can be formed as separate members, or the housing part 10 and the sound emitting part 14 or the sound emitting part 14 and the cover part 13 can be integrally formed. it can.

In the cabinet 2, there is disposed a wall portion 15 extending towards the different positions 2r _1, 2r ₂ in the outer peripheral portion 2r from the central portion 2c of the cabinet 2, the space 2S of the cabinet 2 by the wall portion 15 Is partitioned into two spaces (one space 2S ₁ and the other space 2S ₂ ). In the illustrated example, the wall portion 15 is a plate-like member, and has flat portions 15A and 15B along the axial direction L of the cabinet 2, and the direction of the flat portions 15A and 15B is the direction of the cabinet 2. Each extends in two directions R1 and R2 orthogonal to the axial direction L. In the illustrated example, the angle formed by the two directions R1 and R2 of the plane portions 15A and 15B is in a refraction state that does not become 180 degrees, and the volume of one partitioned space 2S ₁ is equal to that of the other space 2S ₂ . The wall part 15 is arrange | positioned in the cabinet 2 so that it may become larger than a volume. The angle formed by the two directions R1 and R2 of the plane portions 15A and 15B may be 180 degrees as necessary.

Two speaker units 3 (a first speaker unit 3 ₁ and a second speaker unit 3 ₂ ) are arranged in the cabinet 2 (housing unit 10), and the first speaker unit 3 ₁ and the second speaker unit. 3 ₂ is attached to the wall 15. The first speaker unit 3 ₁ and the second speaker unit 3 ₂ are attached to the flat portions 15A and 15B of the wall portion 15, respectively, so that the acoustic radiation directions are respectively in two directions orthogonal to the axial direction L of the cabinet 2. Is pointing. In addition, the first speaker unit 3 ₁ is disposed in _one space 2S ₁ defined by the wall 15 and the second speaker unit 3 ₂ is disposed in the other space 2S ₂ defined by the wall 15; The first speaker unit 3 ₁ and the second speaker unit 3 ₂ are arranged so that the sound radiation surfaces 3a1 and 3a2 face different spaces 2S ₁ and 2S ₂ . That is, the first acoustic radiation surface 3a1 of the speaker unit 3 ₁ faces the other space 2S _2, the second speaker unit 3 _second acoustic arranged on the second space 2S ₂ arranged in one space 2S ₁ Radiation surface 3a2 faces _one space 2S1.

Of in one of the wall space 2S ₁ of 15 in the cabinet 2 is partitioned by, 2S _2, is connected to the first speaker unit 3 ₁ and the second speaker unit 3 ₂ of one or both electrically A control device 40 is arranged. In the illustrated example, a space 2S ₁ and greater than the spatial 2S _2, are arranged a control device (amplifier) 40 in greater space 2S ₁ of. One of the ducts 4 is arranged above the control device 40 as will be described later. The control device 40 is provided with heat radiating fins 40a on the first speaker unit 3 ₁ or the second speaker unit 3 ₂ side. The first speaker unit 3 ₁ and the second speaker unit 3 ₂ driven by the control device 40 are driven in substantially the same phase. Specifically, when the first speaker unit 3 ₁ emits sound waves toward the other space 2S ₂ , the second speaker unit 3 ₂ also emits sound waves toward the other space 2S ₂ . In other words, when the diaphragm of the first speaker unit 3 ₁ vibrates or displaces toward the other space 2S ₂ , the diaphragm of the second speaker unit 3 ₂ vibrates or displaces toward the other space 2S _2. To do.

The speaker device 1 having such a structure can realize a bass-reflex type cabinet system in which only _{one of} the spaces 2S ₁ and 2S ₂ defining the duct 4 communicates with the outside, and the spaces 2S ₁ and 2S will be described later. _{When two} ducts 4 ₁ and 4 ₂ communicating with the outside from each of the _two are provided, an cabinet of an Austimas (registered trademark of Bose Corporation) type can be realized.

Since the cabinet 2 is covered with a lid portion 13 and the speaker units 3 ₁ and 3 ₂ are disposed therein, the speaker units 3 ₁ and 3 ₂ are not exposed, and the cabinet 2 is substantially the speaker unit. 3 ₁ and 3 ₂ are protected. As a result, the speaker device 1 can be provided regardless of the situation around the installation space. The speaker device 1 can avoid a problem that the speaker units 3 ₁ and 3 ₂ are damaged even in a space where there is a movable object around or a place where human hands can easily touch.

In the speaker device 1, ducts 4 (4 ₁ , 4 ₂ ) are formed on the upper portion of the housing unit 10. As a result, the sound emission opening of the duct 4 (4 ₁ , 4 ₂ ) can be effectively opened even when the side of the housing 10 is covered with a support or the like. Further, since the duct 4 (4 ₁ , 4 ₂ ) is open to the side of the cabinet 2, it is under a situation where the top of the lid 13 is covered by placing an object on the lid 13. However, the sound emission opening of the duct 4 (4 ₁ , 4 ₂ ) can be effectively opened. In particular, in the illustrated example, since the upper surface of the lid portion 13 is formed flat, the top of the lid portion 13 can be used as a storage space.

Since the wall portion 15 that divides the space in the cabinet 2 divides the space in the cylindrical cabinet 2 along the cylindrical axis, an internal arrangement that effectively uses the height of the cabinet 2 is possible. Become. In the illustrated example, speaker units 3 ₁ and 3 ₂ are attached so as to be inclined with respect to the formation surface of the wall 15 having the flat portions 15A and 15B along the axis of the cabinet 2 in the illustrated example. Therefore, the speaker units 3 ₁ and 3 ₂ having a diameter corresponding to the height of the cabinet 2 can be provided.

  The wall portion 15 includes radial flat portions 15A and 15B from the central portion 2c of the cabinet 2 toward the outer peripheral portion 2r of the cabinet 2, and the angle of the flat portions 15A and 15B is arbitrarily set so that the inside of the cabinet 2 Can be partitioned at an arbitrary ratio. This makes it possible to adjust acoustic characteristics such as the lowest resonance frequency or a low reproduction band.

By arranging the control unit 40 in the space 2S ₂ in the cabinet 2, it is possible to reduce the size of the speaker device 1 by utilizing the space within the cabinet 2 efficiently. Further, since the control device 40 is provided between the first speaker unit 3 ₁ and the second speaker unit 3 ₂ , the control device 40 is air-cooled by the air flow generated from the speaker units 3 ₁ and 3 ₂ , and the control device 40. The overall temperature can be reduced. At this time, by providing the radiating fins 40a, the air flow generated from the speaker units 3 ₁ and 3 ₂ hits the radiating fins 40a, so that the control device 40 can be further cooled.

In the example shown in the figure, the plane portions 15A and 15B of the wall portion 15 are angled, so that _{one of} the spaces 2S ₁ and 2S ₂ defined in the cabinet 2 is larger than the other, but the larger space By arranging the control device 40 in 2S ₁ , the utilization efficiency of the space in the cabinet 2 is further increased, and the air chamber volume in the cabinet 2 is sufficiently secured.

In the two speaker units 3 ₁ and 3 ₂ , the diaphragms are driven with substantially the same phase. That is, the two speaker units 3 _1, 3 ₂ of the diaphragm substantially simultaneously vibrate so as to enter into the space 2S _2, it vibrates in a direction leaving the space 2S ₂ simultaneously. As a result, it is possible to generate a higher sound pressure than in the case of one speaker unit. When the cabinet 2 is stored in a limited space, the height of the cabinet 2 cannot be increased and the diameter of the diaphragm may not be increased, but the two speaker units 3 ₁ and 3 ₂ are as described above. By driving with substantially the same phase, it is possible to generate a large sound pressure.

The playback sound pressure of the speaker unit is determined by the amount of air exhausted by the diaphragm (proportional to the diaphragm area x amplitude). If the diaphragm area cannot be increased, an attempt to increase the playback sound pressure with the amplitude will result in a large amplitude. It is difficult to design the support system and drive system of the speaker unit that can cope with the above, and as a result, distortion in the reproduced sound pressure tends to occur. When the two speaker units 3 ₁ and 3 ₂ are driven in substantially the same phase as in the embodiment of the present invention, the amplitude of the diaphragm required to generate substantially the same sound pressure can be halved. Therefore, it is possible to obtain a high-quality playback sound with suppressed distortion.
When the two speaker units 3 ₁ and 3 ₂ are driven in substantially the same phase, the diaphragm of the first speaker unit 3 ₁ vibrates or displaces toward the other space 2S ₂ , and the second The diaphragm of the speaker unit 3 ₂ also vibrates or displaces toward the other space 2S ₂ .

Two speaker units 3 _1, 3 ₂ of the diaphragm is substantially vibrate so as to enter into the space 2S ₂ simultaneously, at the same time when the vibration in the direction leaving the space 2S _2, each of the speaker units 3 _1, 3 The distortions of the support system and drive system resulting from ₂ can be canceled each other, and this also makes it possible to obtain high-quality reproduced sound.

FIG. 3 is an explanatory view (a perspective view of the speaker device 1 in a state in which a lid is removed) showing a duct structure of the speaker device according to the embodiment of the present invention. The cabinet 2 is provided with two ducts 4 (first duct 4 ₁ and second duct 4 ₂ ), and among the spaces in the cabinet 2 partitioned by the wall portion 15, one space 2 S ₁ and the outside The first duct 4 ₁ communicates with the other space 2S ₂ and the second duct 4 ₂ communicates with the outside.

The two ducts 4 (the first duct 4 ₁ and the second duct 4 ₂ ) are provided on the acoustic radiation sides of the two speaker units 3 (the first speaker unit 3 ₁ or the second speaker unit 3 ₂ ). As described above, the first speaker unit 3 ₁ and the second speaker unit 3 ₂ are driven by the control device 40 in substantially the same phase, or the second speaker unit 3 ₂ is driven by a passive unit (passive unit). It can also be configured by a radiator). When the second speaker unit 3 ₂ is a passive unit, the voice coil of the _second speaker unit 3 ₂ is short-circuited or the magnetic circuit is removed to support the voice coil or voice coil. A dust cap or the like is provided inside the voice coil support section, and a vibration body (diaphragm, edge, and voice coil that efficiently receives the air pressure released from the back side of the _first speaker unit 31 is provided. A coil support part may be included, or a voice coil may not be provided.

The duct 4 (the first duct 4 ₁ and the second duct 4 ₂ ) has one end 4a between the first speaker unit 3 ₁ and the second speaker unit 3 ₂ and the other end 4a. The end 4b is disposed in the vicinity of the outer peripheral portion 2r of the cabinet 2.

The duct 4 (the first duct 4 ₁ and the second duct 4 ₂ ) partially extends in the axial direction (L direction) of the cabinet 2 from one end to the other end. The cabinet 2 has a shape extending in a direction (R direction) from the central portion 2c toward the outer peripheral portion 2r. That is, the duct 4 has an end portion 4a formed along the axial direction (L direction) of the cabinet 2, and the other portions are formed along a plane substantially perpendicular to the axial direction (L direction). The end 4b is directed to the outer peripheral portion 2r.

Further, the duct 4 (in the illustrated example the first duct 4 ₁₎ at least one of (first duct 4 ₁ and a second duct 4 ₂₎ in the direction toward the outer peripheral portion 2r from the central portion 2c of the cabinet 2 A portion that extends along the outer periphery 2r of the cabinet 2 is formed.

The duct 4 is formed in the cabinet 2, and the first duct 4 ₁ and the second duct 4 ₂ are in a space surrounded by the first speaker unit 3 ₁ , the second speaker unit 3 ₂ and the cabinet 2. Is provided. The duct 4 is formed by partially utilizing the spaces in the spaces 2S ₁ and 2S ₂ , and the bottom surface portion 4c of the first duct 4 ₁ and the second duct 4 ₂ is in the axial direction (L In the direction) with respect to the upper end portions 3b of the first speaker unit 3 ₁ and the second speaker unit 3 ₂ . If necessary, the bottom portions 4c of the first duct 4 ₁ and the second duct 4 ₂ are connected to the first speaker unit 3 ₁ and the second speaker unit 3 ₂ in the axial direction (L direction) of the cabinet ₂ . You may arrange | position in the substantially same position or a high position with respect to the upper end part 3b.

In the illustrated embodiment, among the space 2S _1, 2S ₂ of cabinet 2 which is partitioned by a wall 15, the first duct 4 ₁ to take relatively long for communicating the space 2S ₁ and the outside of the larger The second duct 4 ₂ that communicates the smaller space 2S ₂ with the outside is arranged to be relatively short. Further, the effective length is made relatively large by curving the duct shape of the _first duct 41 that communicates the larger space 2S ₁ with the outside. Also, as further effective length as a result, the duct of the shortest distance flow as the fluid be curved is it going short, the first duct 4 ₁ outlet from the inlet is not visible, i.e. linear In such a form, a simple flow path is not formed. By adopting such a duct form, it becomes possible to lower the low frequency reproduction limit frequency of the speaker device 1, that is, to expand the low frequency reproduction band.

Each of the first duct 4 ₁ and the second duct 4 ₂ has a constant cross-sectional shape (rectangular shape) along the length direction, and suppresses the generation of abnormal noise (wind noise). Yes. The first duct 4 ₁ and the second duct 4 ₂ have a configuration in which the extending direction is changed from the vertical direction (axial direction) to the horizontal direction (direction orthogonal to the axis). The duct flow path is changed with a curvature as large as possible. Also by this, generation | occurrence | production of unusual noise can be suppressed.

Further, the first duct 4 ₁ and the second duct 4 ₂ have bottom surfaces 4c at the upper ends of the first speaker unit 3 ₁ and the second speaker unit 3 ₂ in the axial direction (L direction) of the cabinet 2. The speaker unit 3 ₁ , 3 ₂ in the cabinet 2 is arranged so as to be in a lower position with respect to the portion 3b and efficiently used in the upper part of the empty space where the speaker unit 3 ₁ , 3 ₂ does not exist. As a result, the ducts 4 ₁ and 4 ₂ having a desired diameter and effective length can be formed in a limited space in the cabinet 2, and the ducts 4 ₁ and 4 ₂ are relatively below the bottom surface portion 4 c. A large air chamber can be secured.

FIG. 4 is an explanatory diagram showing the attachment relationship between the casing 10 and the wall 15 in the speaker device 1. The wall portion 15 includes an attached portion 15C to which the first speaker unit 3 ₁ and the second speaker unit 3 ₂ are attached. The plane portions 15A and 15B described above form the attached portion 15C. The attached portion 15 </ b> C has a central contact portion 15 </ b> D whose central portion contacts the central portion 2 c of the cabinet 2, and the outer peripheral portion of the attached portion 15 </ b> C is formed so that both ends are along the outer peripheral portion 2 r of the cabinet 2. It is integrated with the peripheral edge 15E. And the peripheral part 15E of the wall part 15 is provided with the attaching part 15E1 attached to the outer peripheral part 2r of the cabinet 2. As shown in FIG. The attachment portion 15E1 is formed so as to protrude from the peripheral edge portion 15E in a flange shape, and is placed on the placement surface 2ra formed on the outer peripheral portion 2r of the cabinet 2 (housing portion 10). Attached to.

The cabinet 2 includes the above-described casing unit 10 (first casing unit 11). A second casing unit 12 is configured in the first casing unit 11, and the second casing unit 10 includes the second casing unit 12. The housing portion 12 forms the wall portion 15 described above. The second casing portion 12 includes a bottom surface portion 12a and an outer peripheral cylindrical portion 12b. A projecting reinforcing portion 12 c is formed in the second housing portion 12 along the radial direction or the circumferential direction of the cabinet 2. Further, the bottom surface portion 12a of the second casing portion is provided with a speaker unit 3 ₂ , in particular, a protrusion (not shown) that supports a magnetic circuit described later (for example, has a shape like a protrusion 2d described later). ing. The protrusions may form a gap between the magnetic circuit and the bottom portion 10a of the speaker unit 3 _2, thereby reducing the abnormal noise is generated by contact with the speaker unit 3 and the cabinet 2. Incidentally, the buffer material (cushion material, damping material) between the magnetic circuit of the projection and the speaker unit 3 ₂ are provided, it is also possible to reduce the occurrence of abnormal noise.

A terminal portion E ₁ is provided on the outer peripheral portion of the cabinet 2. This terminal portion E ₁ is provided in a sound emitting portion 14 described later, and functions as a terminal portion that electrically connects a control device described later and the outside.

  The housing portion 10 (first housing portion 11) includes a bottom surface portion 10a that supports the wall portion 15 and an outer peripheral cylindrical portion 10b, and a cylindrical portion 10c is provided in the axial direction of the cabinet 2 on the bottom surface portion 10a. It stands up to form a central portion 2c. The bottom surface portion 10 a is provided with a protruding portion 2 d that supports the second housing portion 12. The projecting portion 2 d forms a gap between the bottom surface portion 12 a of the second housing portion 12 and the bottom surface portion of the housing portion 10, thereby contacting the second housing portion 12 and the housing portion 10. This reduces the occurrence of abnormal noise. Note that a cushioning material (cushion material, vibration damping material) may be provided between the protruding portion 2d and the second housing portion 12 to reduce the occurrence of abnormal noise.

  On the mounting surface 2ra formed on the outer peripheral part of the first housing part 11, an outer peripheral part of a sound emitting part 14 as a separate member to be described later is arranged. The coupling portion 2ra1 formed on the placement surface 2ra is coupled to the outer peripheral portion of the sound emitting portion 14.

Further, the first housing part 11 as the first cabinet 2 _1, the wall portion 15 and the second housing portion 12 constitutes a second cabinet 2 _2, cabinet 2 ₂ of the second is The first cabinet 2 ₁ can be separated from the first speaker unit 3 ₁ and the second speaker unit 3 ₂ together. Thus, the wall portion 15 and the two speaker units 3 ₁ and 3 ₂ can be easily attached to the first cabinet 2 ₁ .

Thus, the speaker apparatus 1 is the second cabinet 2 ₂ disposed in the first cabinet 2 _1, second cabinet 2 ₂ on one side of the system (registered trademark of Bose Corporation) Akusute I Mass cabinet Make up volume. The second housing portion 12 and the second cabinet 2 ₂ comprises a first speaker unit 3 ₁ and the second speaker unit 3 wall portion _{15 2} is mounted, the first speaker unit 3 ₁ and a second The speaker unit 3 ₂ is integrally formed. By forming the cabinet 2 ₂ by the second housing portion 12 of the second monolith, it made easy to secure the tightness of the one side of the cabinet volume method (registered trademark of Bose Corporation) Akusute I trout.

In the second cabinet 2 ₂ , the wall portion 15 along the axial direction of the cabinet 2 forms two baffle surfaces, and the first speaker unit 3 ₁ and the second speaker unit 3 ₂ are attached to each of them. It has been. Since the thus baffle surface has become the second cabinet 2 ₂ integrally, the strength of the baffle surfaces can be enhanced, even when driving the speaker device 1, the first speaker unit 3 ₁ and second it can firmly hold the speaker unit 3 _2. That is, the rigidity of the second casing 12 is enhanced by the integral structure of the second cabinet 2 ₂ , and vibration due to air pressure generated by the first speaker unit 3 ₁ and the second speaker unit 3 ₂ is suppressed. Can be suppressed. In addition, vibration generated by driving the first speaker unit 3 ₁ and the second speaker unit 3 ₂ can be canceled in the second casing 12 without being propagated to the entire speaker device 1. It becomes.

The central portion of the wall portion 15 in the second cabinet 2 ₂ is disposed so as to hold the cylindrical portion 10c standing on the central portion 2c of the first cabinet 2 ₁ (first housing portion 11). As a result, the wall portion 15 to which the first speaker unit 3 ₁ and the second speaker unit 3 ₂ are attached is arranged radially (in the circumferential direction) from the central portion 2c. Since the second cabinet 2 ₂ will be positioned at the inner surface of the cylindrical portion 10c and the first housing portion 11, the cylindrical portion substantially a second cabinet 2 ₂ is provided in the first cabinet 2 ₁ The strength of 10c is increased. Since the cylindrical portion 10c forms a mounted portion into which a fixture is inserted, the mounting strength of the cabinet 2 is improved by such a double cabinet structure.

  5A and 5B are explanatory views showing the lid 13 of the speaker device 1 according to the embodiment of the present invention (FIG. 5A is a plan view, and FIG. 5B is a rear perspective view). The lid portion 13 is formed of a flat plate-like member that closes the upper surface of the cabinet 2 described above. A hole 13P is formed in the central portion of the lid 13, and the hole 13P is formed in the surrounding recess 13P1, and the recess 13P1 is a space for accommodating the fixture. On the front surface or the back surface of the lid portion 13, a protruding reinforcing portion 13 a is formed along the radial direction or the circumferential direction of the lid portion 13. Further, a plurality of coupling protrusions 13 b for coupling to a sound emitting unit to be described later are projected from the back surface of the lid portion 13.

FIGS. 6A and 6B are explanatory views showing the sound emitting unit 14 of the speaker device 1 according to the embodiment of the present invention (FIG. 6A is a plan view, and FIG. 6B is a rear perspective view). The sound emitting part 14 forms the duct 4 (first duct 4 ₁ , second duct 4 ₂ ) described above, and can be formed integrally with the cabinet 2 described above, but as shown in the figure. It is also possible to form with another member. The sound emitting part 14 formed in a separate member as is assembled on the housing portion 10 (first housing part 11) to form a first duct 4 ₁ and a second duct 4 _2.

  The sound emitting portion 14 is formed with a joining surface 14s for joining the above-described lid portion 13 on the upper surface, and a joining hole 14p into which the joining projection 13b of the above-described lid portion 13 is fitted is formed on the joining surface. Yes. Moreover, the terminal part provided in a sound emission part is covered with the protection part 14t.

The duct 4 (first duct 4 ₁ , second duct 4 ₂ ) formed in the sound emitting part 14 has an end 4a formed along the axial direction (L direction) of the cabinet 2, and the other parts are It is formed in a direction along a plane perpendicular to the axial direction (L direction), and the end portion 4 b faces the outer peripheral portion 14 a of the sound emitting portion 14. Further, sound emitting part 14 is provided with a first duct 4 ₁ and the second opening 14b formed between the duct 4 _2, closing the opening 14b, 4 ₁ and the first duct The lid portion 13 is joined so as to form the upper surface of the _second duct 42.
In the illustrated example, the opening 4 b included in the first duct 4 ₁ and the second duct 4 ₂ includes a sound emitting portion 14 and a lid portion 13. The corner of the opening 4b formed on the sound emitting portion 14 side is formed in a curved surface, and the corner of the opening 4b formed on the lid 13 side is formed in a square shape, but the lid 13 The corners on the side may be formed in a curved surface, which is preferable in terms of reducing the occurrence of abnormal noise (wind noise).

The lid portion 13 can be integrally joined to the sound emitting portion 14, and the sound emitting portion 14 is attached to the second cabinet 2 ₂ including the _first speaker unit 3 ₁ and the second speaker unit 3 _2. It can be joined together. The mounting portion 14c for attaching the control device 40 is provided in the first duct 4 ₁ of the bottom surface 4c of the sound emitting part 14. Thus, by the lid portion 13 and the sound emitting portion 14 and the first speaker unit 3 ₁ and a second speaker unit 3 ₂ second cabinet 2 ₂ a control device 40 including the integral, the first cabinet 2 ₁ and the (first housing part 11) is separated from, or the first can be attached to the cabinet 2 _1. According to this, it is easy to perform the wiring work of the control device 40, and after all the various adjustments of the speaker units 3 ₁ and 3 ₂ are performed, other parts are integrated in the first cabinet 2 ₁ attached to the installation space. This improves the workability of the assembly work.

7A and 7B are explanatory views showing the speaker unit 3 of the speaker device 1 according to the embodiment of the present invention (FIG. 7A is an external perspective view, FIG. is there. The speaker unit 3 (first speaker unit 3 _first or second speaker unit 3 ₂₎ includes a stationary portion 30 which is formed by a frame or the like, and a vibrator 31 and the magnetic circuit 38 supported by the stationary portion 30 ing. The vibrating body 31 includes a diaphragm 32 and an edge 33 that supports the diaphragm 32 on the stationary portion 30. The magnetic circuit 38 includes a magnet 38A, a yoke 38B, and a plate 38C.

  The vibrating body 31 includes a voice coil 34 and a drive member 35 that transmits the vibration of the voice coil 34 to the diaphragm 32. In the illustrated example, the driving member 35 is provided with a vent hole 35e. The voice coil 34 is wound around a voice coil support portion (voice coil bobbin) 36 and vibrates integrally therewith. One end of the drive member 35 is joined to the diaphragm 32 so that the vibration of the voice coil 34 is transmitted to the diaphragm 32 via the voice coil support 36 and the drive member 35, and the other end of the drive member 35 is supported by the voice coil. It is joined to the part 36.

  The vent hole 35e formed in the drive member 35 may be a hole portion that communicates the space inside and outside the drive member 35, and the lead line drawn out from the voice coil 34 is arranged outside the drive member 35. The hole part as an insertion hole for making it connect with a terminal part may be sufficient. Further, by providing a plurality of vent holes 35e, the drive member 35 may be provided with a hole portion that communicates the space inside and outside the drive member 35 and a hole portion as an insertion hole.

  The diaphragm 32 is formed in a flat plate shape, the outer edge of the diaphragm 32 is joined to the inner edge of the edge 33 directly or through another member, and the outer peripheral portion 33 a of the edge 33 is connected to the stationary portion (frame) 30. It is joined. By making the diaphragm 32 flat, sound waves having substantially the same phase can be radiated from the entire diaphragm 32. In the illustrated example, the outer edge of the diaphragm 32 is attached to the inner edge of the edge 33 via the outer edge of the drive member 35.

  An outer peripheral portion 35a of the drive member 35 is attached to the diaphragm 32, and a concave portion 35b is formed on the outer peripheral portion 35a of the drive member 35 on the side facing the diaphragm 32 (FIG. 7B). (See enlarged view). On the outer peripheral portion 35a of the driving member 35, a protruding portion 35c protruding toward the sound radiation direction is provided outside the outer peripheral portion of the concave portion 35b and the diaphragm 32, and the surface on the magnetic circuit 38 side of the protruding portion 35c. Further, an inner peripheral portion 33b of the edge 33 is attached. The outer peripheral portion 33a of the edge 33 is formed with a greater thickness on the outer side than the inner thickness, and between the outer peripheral portion 30a of the stationary portion (frame) 30 and the outer peripheral portion 33a of the edge 33. A predetermined gap t is formed.

  When the diaphragm 32 and the drive member 35 are joined by the joining member, a recess 35b is formed on the outer surface 35a of the drive member 35 on the side facing the diaphragm 32, and the protrusion 35c protrudes in the acoustic radiation direction. Is provided outside the outer periphery of the recess 35b and the diaphragm 32, so that a joining member (for example, an adhesive or the like) that joins the diaphragm 32 and the drive member 35 travels along the inner surface of the drive member 35 and is magnetic. It can suppress dripping in a gap or the like. Further, since the joining member accumulates in the recess 35b, the joining force between the diaphragm 32 and the drive member 35 can be improved, and the diaphragm 32 can be attached to the drive member 35 at a predetermined position with high accuracy.

  The outer peripheral portion 33a of the edge 33 is formed with a greater thickness on the outer side than the inner thickness, and between the outer peripheral portion 30a of the stationary portion (frame) 30 and the outer peripheral portion 33a of the edge 33. Since the predetermined gap t is formed, it is possible to prevent unnecessary vibration from being transmitted from the diaphragm 32 to the stationary portion 30 via the edge 33. Further, since the outer peripheral portion 33a of the edge 33 is brought into contact with the wall portion 15, air leaks from the joint surface between the speaker unit 3 and the wall portion 15, and the occurrence of abnormal noise occurs due to the air leakage. Can be deterred.

  The vibrating body 31 includes a damper 37 that supports the voice coil 34 on a stationary portion (frame) 30. In the illustrated example, the voice coil 34 is supported on the stationary part 30 by the damper 37 via the voice coil support part 36. The inner peripheral portion 35 d of the drive member 35 and the inner peripheral portion 37 a of the damper 37 are attached to the voice coil 34 or the voice coil support portion 36, and the drive member is disposed on the outer peripheral side surface of the voice coil 34 or the voice coil support portion 36. An annular reinforcing portion 39 that supports the inner peripheral portion 35 d of 35 or the inner peripheral portion 37 a of the damper 37 is connected.

  The speaker unit 3 is provided with a terminal portion 41 on the side of a stationary portion (frame) 30. In the terminal portion 41, both ends of the voice coil 34 are connected to terminals 41a and 41b, respectively. The terminal portions 41 a and 41 b are connected to the connection terminal of the control device 40.

  FIG. 8 is an explanatory view showing a placement example of the speaker device 1 according to the embodiment of the present invention. Here, the speaker device 1 is placed in a wheel of a spare tire provided in the automobile. The same figure (a)-(c) has shown the different form of a fixture.

The speaker device 1 (cabinet 2) has a prescribed shape corresponding to the inner side surface of the wheel T1 of the spare tire T provided in the automobile. In the cabinet 2, a hole 2 a into which a fixture M that is attached to the automobile integrally with the spare tire T is inserted is formed in the central portion 2 c. The opening part 14b which the sound emission part 14 shown in FIG. 6 has comprises the hole 2a in which the fixture M is inserted.
The speaker device 1 is placed on a wheel K included in the spare tire T, and the other end of the attachment tool M is inserted into the hole 2a of the speaker device 1, and the other end of the attachment member M is inserted into the attached member N. Fixed. In addition, a fastening member V is provided at one end of the attachment member M, and the speaker device 1 is fixed to the attached member N side by rotating the fastening member V and attached to the wheel K.

The first duct 4 ₁ and the second duct 4 ₂ described above are provided with sound emitting holes (end portions 4b) on the outer peripheral side surface of the cabinet 2 facing the inner peripheral side surface of the wheel T1 of the spare tire T. between the wheel T1 of the outer peripheral side and the spare tire T of the cabinet 2 which holes are formed, the gap K is provided for guiding the sound waves radiated from the first duct 4 ₁ or the second duct 4 ₂ to the outside ing. Such structure, even when such floor mat is placed on the cabinet 2, the first duct 4 ₁ and the second duct 4 ₂ of sound output holes this gap by securing a gap K It opens to K and it becomes difficult to be sound-insulated. Note the gap K is, may be a sound guide tube for guiding the sound waves radiated from the first duct 4 ₁ or the second duct 4 ₂ to the outside.

  FIG. 9 is an explanatory view showing an automobile equipped with the speaker device according to the embodiment of the present invention. The automobile C includes a speaker device 1, a spare tire T on which the speaker device 1 is placed, and a mounted member N to which the spare tire T is attached. Are integrally attached to the attached member N.

  Here, it is in the form of a cabinet 2 that fits in the wheel T1 of the spare tire T, and acts as an acoustic load of the speaker device 1 by effectively utilizing the space in the wheel T1 of the spare tire T. Further, since the cabinet 2 has a shape corresponding to the wheel shape of the spare tire T, the cabinet 2 can be attached with little backlash in the wheel T1. The shape of the cabinet 2 that fits the wheel T1 can secure the maximum volume of the cabinet to be installed in the wheel T1, which is advantageous for bass reproduction.

  The outer diameter of the cabinet 2 is made smaller than the inner diameter of the wheel T1 so that the cabinet 2 can be attached to the wheel T1 of the spare tire T, and a gap is formed between the outer peripheral side surface of the cabinet 2 and the inner peripheral side surface of the wheel. It doesn't matter. In this case, since the bottom surface of the cabinet 2 is fixed to the wheel T1, abnormal noise is generated by contact between the cabinet 2 and the wheel T1, specifically, contact between the outer peripheral side surface of the cabinet 2 and the inner side surface of the wheel T1. Occurrence can be suppressed.

The first duct 4 ₁ and the second duct 4 ₂ communicating from the _two spaces 2S ₁ and 2S 2 in the cabinet 2 to the outside are respectively used as sound emission parts of an acoustimas (registered trademark of Bose Corporation) type cabinet. It is functioning. By dividing the wheel T1 along the axial direction of the wheel T1 to form the _two spaces 2S ₁ and 2S ₂ , the space in the cylindrical wheel T1 can be used efficiently to register Axtimus (Bose Corporation registration). Trademark) cabinet.

At this time, the wall 15 that divides the spaces 2S ₁ and 2S _{2 includes} an angled mounted portion 15C (plane portions 15A and 15B), and is a space surrounded by the angled plane portions 15A and 15B. 2S ₂ can collect sound waves emitted from the back side of the second speaker unit 3 ₂ and efficiently guide them to the second duct 4 ₂ .

The two speaker units 3 ₁ and 3 ₂ arranged in the cabinet 2 are covered with the lid 13 and are in a substantially protected state. Therefore, even when a tool or the like is provided around the wheel T1 or when the spare tire T is arranged together with other storage items in the trunk room, the speaker units 3 ₁ and 3 ₂ in the cabinet ₂ are damaged. I will not receive it. Incidentally, if the speaker device 1 is a subwoofer for low sound reproduction, the directivity characteristic in the low sound region is relatively small, so even when the speaker device 1 is placed in a spare tire wheel in the trunk room, It is possible to provide playback sound throughout the vehicle.

And since the first duct 4 ₁ and second duct 4 ₂ of sound emission hole in a portion (upper portion) closer to the opening of the wheel T1 is provided, waves interfere percentage wheel T1 being sounded Can be reduced. If the sound emission hole of the duct 4 is located below, the sound wave emitted is attenuated by the side of the wheel T1 and is attenuated before reaching the vehicle interior. According to the speaker device 1, There is no problem.
The spare tire is arranged under the floor of the trunk room of the automobile (under the floor mat) or the like. However, the spare tire is not limited to this and may be arranged in a place in the automobile that does not affect occupant riding.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

Claims (16)

A cabinet composed of a housing part and a lid part;
A wall portion disposed in the cabinet and extending from the central portion of the cabinet toward two different positions on the outer peripheral portion to partition the cabinet space;
A plurality of speaker units disposed in the cabinet and attached to the wall,
The first speaker unit is disposed in one space defined by the wall, the acoustic radiation surface of the first speaker unit is directed to the other space defined by the wall, and the first speaker unit is disposed in the other space. 2 speaker units are arranged, and the acoustic radiation surface of the second speaker unit is directed to the one space,
The speaker device, wherein the cabinet is provided with a duct for communicating the space with the outside.   2. The speaker device according to claim 1, wherein the duct includes a first duct that allows the one space to communicate with the outside, and a second duct that allows the other space to communicate with the outside. .   The speaker device according to claim 2, wherein the speaker unit directed to one of the first and second ducts is a passive unit. The first duct and the second duct are:
One end is disposed between the first speaker unit and the second speaker unit, and the other end is disposed near the outer periphery of the cabinet,
From the one end to the other end, a part extends in the axial direction of the cabinet and the other part has a shape extending in the direction from the central part to the outer peripheral part of the cabinet. The speaker device according to claim 2, wherein   The part which extends along the direction which goes to the said outer peripheral part from the said center part of the said cabinet which at least one of the said duct has is formed adjacent to the said outer peripheral part of the said cabinet. Item 3. The speaker device according to Item 2.   The said 1st duct and the said 2nd duct are provided in the space enclosed with the said 1st speaker unit, the said 2nd speaker unit, and the said cabinet, The Claim 5 characterized by the above-mentioned. Speaker device.   The bottom surfaces of the first duct and the second duct are lower than the upper ends of the first speaker unit and the second speaker unit in the axial direction of the cabinet. The speaker device according to 1. The wall portion includes an attached portion for attaching the first speaker unit and the second speaker unit;
The speaker device according to claim 7, further comprising a peripheral portion formed along the outer peripheral portion of the cabinet at the outer peripheral portion of the attached portion.   The speaker device according to claim 8, wherein a peripheral portion of the wall portion includes an attachment portion attached to an outer peripheral portion of the cabinet. The housing unit included in the cabinet is used as a first housing unit, and a second housing unit is configured in the first housing unit.
The second casing part includes a bottom part and an outer peripheral cylinder part,
The speaker device according to claim 9, wherein the second casing portion forms the wall portion. The cabinet that the first casing portion constitutes as the first cabinet,
The second housing part constitutes a second cabinet formed in the first cabinet;
The speaker device according to claim 10, wherein the second cabinet is separated from the first cabinet integrally with the first speaker unit and the second speaker unit.   The speaker device according to claim 11, wherein a protruding reinforcing portion is formed in the second casing portion along a radial direction or a circumferential direction of the first cabinet. The first housing part includes a bottom part that supports the wall part, and an outer peripheral cylinder part,
The speaker device according to claim 12, wherein the lid is formed in a flat plate shape. Between the first casing part and the lid part, a sound emitting part including the first duct and the second duct is disposed,
The outer peripheral part of the sound emitting part is disposed on the outer peripheral part of the first housing part,
The speaker device according to claim 13, wherein the first casing portion, the lid portion, and the sound emitting portion are formed of separate members. The sound emitting part includes an opening formed between the first duct and the second duct,
The speaker device according to claim 14, wherein the lid is attached to the sound emitting unit, and an opening of the sound emitting unit is closed. An automobile comprising: the speaker device according to claim 1; a spare tire on which the speaker device is placed; and a mounted member to which the spare tire is attached.

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